<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../vue.js"></script>
</head>

<body>
    <div id="app">
        <button @click = "isHot = !isHot">点击切换天气</button><br/>
        <p>今天真{{isHot ? "热" : "冷" }}啊</p>

        <img :src="url" alt="">
        
    </div>
    <script>
        Vue.config.productionTip = false;
        
        const vm = new Vue({
            el: "#app",
            data() {
                return {
                    isHot:true,
                }
            },
            computed:{
                url(){
                    return this.isHot ? "./png-0015.png" : "./png-0018.png"
                }
            }
        })
    </script>
</body>

</html>